A revised classification of the North American Lower Paleozoic.
APA Citation
Grabau, A. W. (Amadeus William). (1909). A revised classification of the North American Lower Paleozoic. [Cambridge].
MLA Citation
Grabau, Amadeus W. (Amadeus William), 1870-1946. A Revised Classification of the North American Lower Paleozoic. [Cambridge], 1909.
Warning: These citations may not always be complete (especially for serials).